1、(PDF) BIOFERTILIZER

The experiment suggested that application of urea coated by carrier-based biofertilizer was reliable to support lettuce cultivation and reduce the urea dose.

2、Effects of Foliar Fertilization: a Review of Current Status and Future

Foliar fertilizer application after soil fertilization is an effective method to increase the contents of trace elements in crops and crop yield, and to improve the soil environment. However, the application of inorganic foliar fertilizer results in difficulties in nutrient absorption and migration in plants.

3、Fertilization Methods and Precautions for Lettuce_NEWS_Bozu Marine Bio

Generally, watering can be done 1 to 3 times as needed, and foliar fertilization with a 0.1% potassium dihydrogen phosphate and 0.3% urea solution can be applied 1 to 2 times for significant yield increase.

Can urea be used as foliar fertilizer? Urea foliar spray precautions

The fourth point, the spraying part, urea when the foliar fertilizer is sprayed, the nozzle should be facing upwards and diagonally facing the back of the leaf, which can increase the nutrient absorption rate.

Fertilization Methods and Precautions for Lettuce

Generally, watering can be done 1 to 3 times as needed, and foliar fertilization with a 0.1% potassium dihydrogen phosphate and 0.3% urea solution can be applied 1 to 2 times for significant yield increase.

Foliar nutrition: Potential and challenges under multifaceted

The potential of foliar fertilization in improving crop yield and quality under environmental stresses has been evaluated based on a meta-analysis. Foliar-applied fertilizers showed higher crop plants yield and quality traits by 15–19% and 9–29%, respectively, under different environmental stresses.

Research progress in uptake and metabolism of foliar urea in plants

The effectiveness of foliar application and the efficient assimilation of urea by leaves are influenced by various factors, including foliar structure, environmental conditions, and carbon-nitrogen metabolism.

Full article: Novel, high

Leafy vegetable yields can be increased using stabilized urea amine fertilizer. We identify proxy traits for yield in young seedlings, which could be utilized in breeding and phenotyping programs for a wide range of species.

(PDF) Effect of foliar applications of urea, ethanol and putrecine on

Foliar fertilization of urea (0.6 %) as nitrogen sources could be suggested to have better yield and growing properties in lettuce production.

Influence of Different Types of Fertilizers Application on the Lettuce

Abstract: The experiment was conducted during the period from March to the end of April 2019 to observe the effect of different fertilizer regimes on the growth, quality and yield of lettuce...

Lettuce (also known as leaf lettuce or stem lettuce) is a popular vegetable valued for its crisp leaves and refreshing flavor. Proper fertilization is critical to ensuring healthy growth, yield, and quality during cultivation. Urea, a commonly used nitrogen fertilizer, provides essential nitrogen for plant development and promotes lettuce seedling growth. Below is a detailed guide on applying urea foliar fertilizer to lettuce seedlings, along with key fertilization tips.

1. Correct Methods for Applying Urea Foliar Fertilizer

(1) Prepare Tools

• Use a sprayer or watering can.
• Ensure the nozzle is clean and free of blockages.

(2) Dilute Urea

• Mix urea solution according to instructions on the packaging or label.
• Use fresh water (avoid hard water like well water or river water), as calcium and magnesium ions in hard water may react with urea to form insoluble沉淀物, reducing effectiveness.

(3) Choose Optimal Timing

• Apply in the morning or evening when plants absorb nutrients most efficiently.
• Avoid mid-day heat, which causes rapid evaporation and reduces fertilizer efficacy.

(4) Spray Evenly

• Cover all leaf surfaces uniformly with the diluted urea solution.
• Avoid overapplication to prevent waste or leaf burn.

2. Fertilization Tips

(1) Understand Lettuce’s Needs

• Lettuce is a light-loving plant requiring sufficient sunlight for photosynthesis.
• Nitrogen promotes leafy growth, but excessive nitrogen leads to weak stems, reduced yield, and poor quality.

(2) Monitor Plant Responses

• Observe leaf color, yellowing, or excessive growth after fertilization.
• If abnormalities occur, stop fertilizing and check dosage and type.

(3) Balance with Other Fertilizers

• Combine urea with phosphorus and potassium fertilizers for balanced nutrition.
• Phosphorus strengthens roots and disease resistance; potassium enhances cold tolerance and flower bud differentiation.

(4) Maintain Regular Application

• Fertilize every 2 weeks, adjusting frequency based on growth stage and soil conditions.
• Increase applications during rapid growth periods for adequate nutrient supply.

3. Precautions

(1) Avoid Direct Contact

• Prevent urea solution from touching flowers, fruits, or other plant parts to avoid damage.
• Rinse skin or eyes immediately with water if accidentally exposed.

(2) Safety Distance

• Keep flammable materials (e.g., curtains, paper) away from the application area.
• Avoid splashing on clothing or footwear to prevent staining.

(3) Storage

• Store urea in a cool, dry place away from sunlight and humidity.
• Seal opened packages tightly to preserve freshness.

By following these steps and precautions, urea foliar fertilizer can effectively support lettuce seedling growth. Remember: proper fertilization balances plant needs and soil conditions, maximizing health and yield.